<div>
    <h3>TestDom3</h3>
    <input #colorIndex type='text' />
    <button (click)='changeColor(colorIndex.value)'>change color</button>
    <div id="kk1" style="width: 100px;height: 100px;background: white;"></div>
    <div id="kk2" style="width: 100px;height: 100px;background: white;"></div>
    <div class="gg1" style="width: 100px;height: 100px;background: white;"></div>
    <div class="gg2" style="width: 100px;height: 100px;background: white;"></div>
    <test-dom3-child></test-dom3-child>
  </div>
  